package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor{

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
        Map<Object,Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY+token);//取出所有键值对，返回map


        //判断用户是否存在
        if(userMap.isEmpty()){
            //不存在,直接放行
            return true;
        }
        //将查询到的hash数据转换为userDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //存在，保存用户信息到threadlocal
         UserHolder.saveUser(userDTO);

         //刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY+token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);

        //放行
        return true;
    }



    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
